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. there is some corals that live for many thousands of yeernz we found through some of the science we do we can drill holes down to the center of the corals and look at annual growth rings and we can look at when, in fact, when the first agriculture in australia happened, we saw a change in the type of chemistry that the annual growth rings and coral were depositing. so we have seen a chronology of
isn't rocket science. it's just common sense. from td ameritrade. >>> we've heard it all morning long it and still makes us jump. a huge 747 crashing in the dessert, by remote control, all part of the discover channel's new "curiosity" series where a controlled experiment was captured by 40 cameras and sensors to give researchers what happens during a crash atlantaing. >> it airs on discovery channel this sunday night at 9 p.m. two top experts are here with us now, accident investigator dr. tom barth and dr. cindy bir. >> thank you for being with us this morning. we're very excited about this. >> i asked you, dr. bir, earlier, have you ever attempted to do this before and you said you have. this took over four years to plan. why did you want to crash a plane? >> we were -- i was approached by a production company to do this about four years ago. i think tom and i were approached about the same sometime. and was just such an interesting project. i didn't attempt it before, but it was attempted back in '84. and they had lessons learned. we have new technology. so, it was a wonderful opp
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